It seems pretty clear that if the blade stalls and then experiences greater AoA due to flapping that the peak AoA is after the stall and not at the point of stall or don't you understand your own musings.
The only time there is symmetry of pitch is in a free air hover in zero wind or at min pitch on the ground in nil wind.
Aerodynamic effects do not produce symmetry of pitch, only symmetry of lift.